If slacking uses giga impact does he need to wait two turns?

Question

If he dosen't then he would be the perfect pokemon for that move

Answer 1

I'm not sure, but no. He is immobilized by his ability and at same time by attack.

Comments

Yep, this is correct. He "slacks off" in the same turn he would be resting.

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This is the same with hyper beam and any other "needs to recharge" move.